Embossing rolls



June 26, 1962 H. M. HANSON 3,040,799 EMBOSSING ROLLS Filed Sept. 8, 19591 N VEN TOR. HEN/2 M HAM 50W ATTO QWEV United dtates 3,040,799 EMBOSSINGROLLS Henry M. Hansen, Glendora, Caliti, assignor to Hunter Engineering(30., Riverside, Calif., a corporation of California Filed Sept. 8,1959, Ser. No. 838,691 4 Claims. (Cl. 153-77) This invention relates toa set of rolls for embossing or forming sheet or strip stock,particularly sheet metal.

An object of the invention is to provide sheet forming or embossingrolls that may emboss plain sheet stock or may emboss sheet stockalready provided with an embossed pattern, in the latter case, withoutaffecting or eifacing such embossed pattern. Thus, any design or patternon the sheet stock being passed through the rolls is left undefaced andundisturbed except for the embossing performed by the rolls.

Another object of the invention is to provide embossing rolls of thecharacter referred to that draw the metal being embossed along only theareas of embossment, thereby producing an embossed sheet that hassubstantially the original width but is stable and highly resistant tobuckling across the formed or embossed pattern.

The invention also has for its objects to provide such means that arepositive in operation, convenient in use, easily installed in a workingposition and easily disconnected therefrom, economical of manufacture,relatively simple, and of general superiority and serviceability.

The invention also comprises novel details of construc tion and novelcombinations and arrangements of parts, which will more fully appear inthe course of the following description. However, the drawing merelyshows and the following description merely describes one embodiment ofthe present invention, which is given by way of illustration or exampleonly.

In the drawing, like reference characters designate similar parts in theseveral views.

FIG. 1 is a side elevational view of a pair of embossing 1 rollsaccording to the present invention.

FIG. 2 is an enlarged, broken longitudinal sectional view of a portionof the rolls shown in FIG. 1.

The present embossing rolls comprise a forming roll 5 and a mating roll6. In a conventional manner, said rollers are mounted in bearings 7 torotate on their respective axes 8 and 9' in opposite directions. IConnecting gears 10 provide such opposite rotation. It will be clearthat the rolls 5 and 6 will feed a sheet 11 between them and the rollswill form such sheets according to the characteristics of the formingroll 5.

According to the present invention, the roll 5 is provided with aplurality of forming rings or flanges 12 that are coaxially mounted on acore or body-13 that is fixedly connected to the shaft 8 by end webs14-. The rings are held in desired spaced relation by spacer collars 15that vary in length according to the desired spacing of the rings 12.End collars 15 lock the assembly of rings 12 and collars 15 and saidcollars 16 are suitably aflixed to the body 13 to achieve such lockingof the assembly.

It is the outer periphery of the rings 12 that do the forming. Hence,the same may have a transverse shape or be provided with surfacemarkings or knurling, as desired. Inthis case, the ring peripheries havea halfround form that would form half-round grooves 17 to a sheet 11 asthe same is drawn between the rolls. It will be clear that thedifference of outer diameter between rings 12 and collars 15 and 16 issuch that, during forming, the sheet 11 is spaced from the spacers 15.Therefore, any design or pattern that may be initially provided on thesheet is unaffected by the forming operation except by the addition ofthe grooves 17.

The roll 6 comprises a cylindrical body 18 afiixed to the shaft 9 by endwebs 19, and a rubber liner 2% on said body. The term rubber is hereused to designate compressible material whether made of natural orsynthetic rubber or of other materials, for instance, synthetic resinhaving similar compressible properties.

The rolls 5 and 6 may be set relatively so'that the rings 12 have theirperipheries tangent to the outer face of liner 20. However, this settingmay be varied according to the depth of forming desired and according tothe thickness of the sheet 11. Hence, the rings may bite into the lineror may be spaced therefrom. In any case, the spacing is such that thethickness of sheet 11 is greater than such spacing, causing the rings toform grooves in said sheet.

It will be seen that, as the grooves 17 are formed, the same displacegrooves in the liner 20. Considerable friction between the sheet grooves17 and the grooves or indentations in the liner is created, therebyinsuring trans verse stability of the original sheet width. The portionsof the sheet between grooves 17 are unaffected by the stretch caused bythe rings 12. As a consequence, a sheet formed by the present rolls isresistant to buckling and, as above explained, retains on its surfaceany design or pattern initially formed thereon. The mentioned stabilityof transverse size results from eliminating deforming forces or stresseson the sheet between grooves 17. Such stretch as occurs is present onlywhere the rings 12 form the sheet to provide the grooves 117.

As can be seen from FIG. 2, the outer diameter of the rings 12 isgreater than the outer diameter of spacers 15, the difference being morethan half the thickness of a sheet 11 being embossed. Hence, duringembossment, any previous embossment in the sheet cannot be obliteratedbecause the same is spaced from the spacers 15 and is in contact onlywith the compressible liner 29.

While the foregoing specification illustrates and describes what I nowcontemplate to be the best mode of carrying out my invention, theconstruction is, of course, subject to modification without departingfrom the spirit and scope of my invention. Therefore, I do not desire torestrict the invention to the particular form of constructionillustrated and described, butdesire to cover all modifications that mayfall within the scope of the appended claims. 7

Having thus described the invention, what is claimed and desired to besecured by Letters Patent is:

1. Embossing rolls for embossing sheet material comprising a formingroll provided with coaxial forming rings larger in outer diameter thanthe diameter of the roll, half said diametral difference beingsubstantially greater than the thickness of a sheet being embossed, anda mating roll provided with a compressible outer liner that iscompressed by grooves formed by the outer peripheries of the formingrings in a sheet passed between the rolls.

2. Embossing rolls comprising two mating rolls having their outersurfaces spaced apart a distance substantially greater than thethickness of a sheet passed therebetween, one roll having a compressibleface, and the other roll being provided with coaxi-ally forming ringsapproximately tangent to said face and adapted to form grooves in saidsheet by forcing the same in a direction to compress said surface.

3. Embossing rolls comprising two rolls, each having a cylindrical bodyand mounted to rotate oppositely, the outer faces of said rolls beingspaced apart a distance greater than the thickness of a sheet passingbetween the rolls during rotation thereof, one roll surface beingcornpressible, and the other being provided with at least one coaxialembossing ring to form a groove in the sheet and 3 4 r011 comprising acylindrical body provided with a com 2,277,725 Smith et a1. Mar. 31,1942 pressible outer liner, the rolls being so spaced that the 2,609,568Getchell Sept. 9, 1952 liner and the outer faces of the collars areepaeed a dis- 7 2,695,857 Lewis et a1 Nov. 30, 1954 tance greater thanthe thickness of a sheet being embsssed 2,708,958 Grafton May 24, 1955by the 7 5 FOREIGN PATENTS References Cited in the file of this patent141,646 Australia June 18, 1951 UNITED STATES PATENTS 956,140 McCannApr. 26, 1910 10

